I bought one of his klein bottles expecting only a klein bottle. Much to my surprise even the cardboard box it came in was hand decorated with drawings made in

I bought one of his klein bottles expecting only a klein bottle. Much to my surprise even the cardboard box it came in was hand decorated with drawings made in marker. Inside there was a packet of information about klein bottles stuffed to the gills with witty humor about topology and science and signed by Cliff. Every detail made me laugh and smile. This is so clearly a labor of love for him, I've never seen anyone else put this much effort into bringing joy into the world.